Cell Structure and Function | |
Cell Photodamage, a Potential Hazard when Measuring Cytoplasmic Ca2+ with Fura-2 | |
Eva Grapengiesser1  | |
[1] Department of Medical Cell Biology, University of Uppsala | |
关键词: calcium oscillations; fura-2; islets of Langerhans; pancreatic β-cells; photodamage; ultraviolet light; | |
DOI : 10.1247/csf.18.13 | |
学科分类:分子生物学,细胞生物学和基因 | |
来源: Japan Society for Cell Biology | |
【 摘 要 】
References(24)Cited-By(20)Photodamage of insulin-releasing pancreatic β-cells during measurements of the cytoplasmic Ca2+ concentration ([Ca2+]i) with fura-2 was studied. Keeping the fluorescence intensities at low levels, regular oscillations of [Ca2+]i with a frequency of 0.2-0.5 min-1 could be recorded for more than 60 min in glucose-stimulated cells. However, after a ten fold increase of the excitation energies, oscillations disappeared in most cells, the glucose response being transformed into an elevated concentration of [Ca2+]i with irregular fluctuations. Under corresponding conditions, the loss of fluorescence due to photobleaching during the initial 10 min increased from 7 to 16% in cell-sized fura-2-containing droplets. In further attempts to investigate the effects of photodamage, cells were irradiated by pulses (< 1 ms) of intense UV light (300-400 nm). A single flash of 4-7 mJ/mm2 perturbed the oscillatory pattern with maintenance of the glucose response in terms of raised [Ca2+]i. More severe lesions obtained by repeated pulses of 13-15 mJ/mm2 involved an excessive and uncontrolled rise of [Ca2+]i. It is concluded that there is a significant potential risk of photodamage when using the fura-2 technique. In the pancreatic β-cells, exposure to intense excitation light may even result in a selective suppression of the oscillatory response to glucose.
【 授权许可】
Unknown
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